Caroline Wozniacki of Denmark (right) shakes hands with Garbine Muguruza of Spain after victory during their women's singles semi-final match at the Pan Pacific Open tennis tournament in Tokyo on Sept 23, 2017.PHOTO: AFP

Anastasia Pavlyuchenkova of Russia (R) and Angelique Kerber of Germany pose for the media prior to their women's singles semi-final match at the Pan Pacific Open tennis tournament in Tokyo on Sept 23, 2017PHOTO: AFP

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